function jumpFloor(number)
{
    // write code here
    var npre = 1 // 0级台阶
    var ncur = 1 // 1级台阶
    for(let i = 2;i <= number; i++){
      var temp = ncur
      ncur = npre + ncur
      npre = temp
    }
    return ncur
}
module.exports = {
    jumpFloor : jumpFloor
};